Damian Thompson is Editor of Telegraph Blogs and a columnist for the Daily Telegraph. He was once described by The Church Times as a "blood-crazed ferret". He is on Twitter as HolySmoke. His latest book is The Fix: How addiction is taking over your world. He also writes about classical music for The Spectator.

Obama is the most extreme pro-abortion politician in the history of Congress

"Barack Obama is the most extreme pro-abortion candidate ever to seek the office of President of the United States. He is the most extreme pro-abortion member of the United States Senate. Indeed, he is the most extreme pro-abortion legislator ever to serve in either house of the United States Congress."

So writes Robert George, a professor of jurisprudence at Princeton, in an online essay that, since it was published a few days ago, has persuaded many conservative Christians that – whatever McCain's failings – Obama shows a horrific disregard for unborn life that should disqualify him from serving as a commissioner of drains, let alone president.

Prof George is writing on Public Discourse, a site launched this month that publishes twice-weekly essays on ethics and the common good, mostly from a conservative perspective. His analysis of Obama's rabidly pro-abortion stance – which does not even extend to protecting babies that survive a partial-birth abortion – fills me with horror. What sort of man feel the need to take his "pro-choice" position to such a barbaric extreme? How can Catholics of any political persuasion vote for him?

I don't normally quote long extracts from online essays, but just this once…

In an act of breathtaking injustice which the Obama campaign lied about until critics produced documentary proof of what he had done, as an Illinois state senator Obama opposed legislation to protect children who are born alive, either as a result of an abortionist's unsuccessful effort to kill them in the womb, or by the deliberate delivery of the baby prior to viability. This legislation would not have banned any abortions. Indeed, it included a specific provision ensuring that it did not affect abortion laws. (This is one of the points Obama and his campaign lied about until they were caught.) The federal version of the bill passed unanimously in the United States Senate, winning the support of such ardent advocates of legal abortion as John Kerry and Barbara Boxer. But Barack Obama opposed it and worked to defeat it. For him, a child marked for abortion gets no protection-even ordinary medical or comfort care-even if she is born alive and entirely separated from her mother. So Obama has favored protecting what is literally a form of infanticide.

You may be thinking, it can't get worse than that. But it does.

For several years, Americans have been debating the use for biomedical research of embryos produced by in vitro fertilization (originally for reproductive purposes) but now left in a frozen condition in cryopreservation units. President Bush has restricted the use of federal funds for stem-cell research of the type that makes use of these embryos and destroys them in the process. I support the President's restriction, but some legislators with excellent pro-life records, including John McCain, argue that the use of federal money should be permitted where the embryos are going to be discarded or die anyway as the result of the parents' decision. Senator Obama, too, wants to lift the restriction.

But Obama would not stop there. He has co-sponsored a bill-strongly opposed by McCain-that would authorize the large-scale industrial production of human embryos for use in biomedical research in which they would be killed. In fact, the bill Obama co-sponsored would effectively require the killing of human beings in the embryonic stage that were produced by cloning. It would make it a federal crime for a woman to save an embryo by agreeing to have the tiny developing human being implanted in her womb so that he or she could be brought to term. This "clone and kill" bill would, if enacted, bring something to America that has heretofore existed only in China-the equivalent of legally mandated abortion. In an audacious act of deceit, Obama and his co-sponsors misleadingly call this ananti-cloning bill. But it is nothing of the kind. What it bans is not cloning, but allowing the embryonic children produced by cloning to survive.

Can it get still worse? Yes.

Decent people of every persuasion hold out the increasingly realistic hope of resolving the moral issue surrounding embryonic stem-cell research by developing methods to produce the exact equivalent of embryonic stem cells without using (or producing) embryos. But when a bill was introduced in the United States Senate to put a modest amount of federal money into research to develop these methods, Barack Obama was one of the few senators who opposed it. From any rational vantage point, this is unconscionable. Why would someone not wish to find a method of producing the pluripotent cells scientists want that all Americans could enthusiastically endorse? Why create and kill human embryos when there are alternatives that do not require the taking of nascent human lives? It is as if Obama is opposed to stem-cell research unless it involves killing human embryos.

If the Tablet crowd read that analysis, how will they react? Will they reassess their schoolgirlish infatuation with the Illinois senator? Or will they say: "Yes, that's unfortunate, but at least he's not a Republican…"? I think we can guess the answer.